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STATE of UTAH DEPARTMENT of NATURAL RESOURCES Technical Publication No. 66 AQUIFER TESTS of the NAVAJO SANDSTONE NEAR CAINEVILLE

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STATE of UTAH DEPARTMENT of NATURAL RESOURCES Technical Publication No. 66 AQUIFER TESTS of the NAVAJO SANDSTONE NEAR CAINEVILLE STATE OF UTAH DEPARTMENT OF NATURAL RESOURCES Technical Publication No. 66 AQUIFER TESTS OF THE NAVAJO SANDSTONE NEAR CAINEVILLE, WAYNE COUNTY, UTAH by J. W. Hood and T. W. Danielson Hydrologists, U.S. Geological Survey Prepared by the United States Geological Survey in cooperation with The Utah Department of Natural Resources Division of Water Rights 1979 CONTENTS Page Conversion factors: Inch-pound to metric............................... vi Abstract 1 Introduction 2 Background 2 We11- and spring-numbering system 6 Terms 6 Geologic setting 9 The Navajo Sandstone 12 Hydraulic properties of cores 13 Hydraulic conductivit Y 16 Porosity 19 Tests on discharge wells 19 Transmissivity 30 Storage coefficient 32 Long-term pumping effects 33 Chemical quality of ground water 34 Conclusions 36 References cited 37 Publications of the Utah Department of Natural Resources, Division of Water Rights 61 ILLUSTRATIONS Figure 1. Map showing location of the lower Dirty Devil River basin area and the test area near Caineville . 3 2. Map showing geology of the test area and location of wells and springs near Caineville . 4 3. Diagram showing wel1- and spring-numbering system used in Utah . 7 4. Generalized east-west section showing folding in the Navajo Sandstone . 11 5. Photomicrographs of core sample 76UT1, Navajo Sandstone ..... 14 6. Graph showing particle-size distribution for four cores from the Navajo Sandstone . 15 7. Photomicrographs of core sample 76UT2, Navajo Sandstone ..... 16 8. Photomicrographs of core sample 76UT3, Navajo Sandstone ..... 17 9. Graph showing hydraulic conductivity and porosity of core samples from the Navajo Sandstone . 20 iii Illustrations--Continued Page Figure 10. Graphs showing water levels in wells in the Red Desert...... 24 11. Graphs showing relation of water level in well OW-1A to change in barometric pressure and earth tides 25 12. Graph showing water levels in well OW-1A 25 13. Representative data analyses from 35-day aquifer test ..... 26 14. Graph showing analysis of residual drawdown in well TW-l after pumping for 35 days 28 15. Graph showing analysis of residual drawdown in well TW-l after pumping for 11 days at increasing rates of discharge. ............................................... 29 16. Graph showing drawdown as a function of distance from well TW-l after pumping for 30 days 31 17. Graphs showing water levels in wells (D-28-7)36bbb-l and (D-28-8)29cdc-l 32 18. Graph showing theoretical effect of long-term pumping at well TW-l 33 TABLES Table 1. Formations that crop out in or underlie the Caineville area . 10 2. Grain-size diameters of four cores from the Navajo Sandstone 12 3. Statistical characteristics of grain-size analyses, specific gravity, and carbonate content of four cores from the Navajo Sandstone 13 4. Hydraulic conductivity and porosity determined by the Geological Survey for core samples from wells TW-l and OW-1A 18 5. Hydraulic conductivity and porosity determined by Chemical and Geological Laboratories, Casper, Wyo., for core samples from wells TW-l and OW-1A 18 iv Tables--Continued Page Table 6. Hydraulic conductivity and porosity determined by Core Laboratories, Inc., Wilmington, Calif., for core samples from wells TW-1 and QW-1A 19 7. Summary of results from aquifer tests 22 8. Records of selected wells and springs 39 9. Selected logs of wells . 40 10. Selected chemical analyses of water samples . 58 11. Measurements of discharge, temperature, and specific conductance of water from wells . 59 v CONVERSION FACTORS: INCH-POUND TO METRIC Most values in this report are given in inch-pound units followed by metric units. The conversion factors are shown to four significant figures. In the text, however, the metric equivalents are shown only to the number of significant figures consistent with the accuracy of the value in inch-pound units. Inch-pound Metric Unit Abbreviation Unit Abbreviation (Multiply) (by) (to obtain) Acre 0.4047 Square hectometer hm 2 .004047 Square kilometer km 2 Cubic foot per (ft 3 /d)/ft .0929 Cubic meter per (m 3 /d)/m day per foot or ft 2 /d day per meter or m2 /d Foot ft .3048 Meter m Gallon per gal/min .06309 Liter per second L/s minute Gallon per (gal/min)/ft .2070 Liter per second (L/s)/m minute per per meter foot Inch in. 25.40 Millimeter rnrn 2.540 Centimeter ern Mile 1.609 Kilometer km 2 Square foot .0929 Square meter m Chemical concentration and water temperature are given only in metric units. Chemical concentration is given in milligrams per liter (mg/L) or micrograms per liter (Wg/L). Milligrams per liter is a unit expressing the concentration of chemical constituents in solution as weight (milligrams) of solute per unit volume (liter) of water. One thousand micrograms per liter is equivalent to one milligram per liter. For concentrations less than 7,000 mg/L, the numerical value is about the same as for concentrations in the inch-pound unit, parts per million. Chemical concentration in terms of ionic interacting values is given in milliequivalents per liter (meq/L). Meq/L is numerically equal to the inch-pound unit, equivalents per million. Water temperature is given in degrees Celsius (OC), which can be converted to degrees Fahrenheit (OF) by the following equation: OF = 1.8(OC) + 32. vi AQUIFER TESTS OF THE NAVAJO SANDSTONE NEAR CAINEVILLE, WAYNE COUNTY, UTAH by J. W. Hood and T. W. Danielson Hydrologists, U.S. Geological Survey ABSTRACT Ground water in the Navajo Sandstone near Caineville, Wayne County, Utah, was studied during 1975-77 as part of an investigation of water in bedrock in the lower Dirty Devil River basin area. The purpose of the study near Caineville was to determine the water-bearing properties of the Navajo by utilizing data obtained mainly during test drilling and aquifer testing by the Intermountain Power Project. Consolidated rocks that crop out in the area range in age from Cretaceous to Jurassic. The area is underlain by older Mesozoic and Paleozoic sedimentary rocks that extend to a depth of at least 7,160 feet (2,182 meters) . The Navajo Sandstone is the major known aquifer in the area, yield­ ing 2,800 and 3,110 gallons per minute (177 and 196 liters per second) to two test wells near Caineville. The Navajo Sandstone is massive, crossbedded, very fine to fine grained, and approximately 900 ft (274 meters) thick. For the practical purpose, of aquifer analysis, it is hydraulically isotropic in unfractured parts. It has an average hydraulic conductivity of 0.5 foot per day (0.15 meter per day), and an inferred transmissivity of 450 feet squared per day (42 meters squared per day). Folding of the sandstone has produced fracturing that probably permits some interformational leakage. The leakage under natural conditions is up­ ward, under high artesian head; and it probably contributes to the salinity of the water in the sandstone. Fracturing of the sandstone has enhanced the permeability and made the formation heterogeneous and probably anisotropic on a regional scale. Values for transmissivity, obtained from tests of various lengths, range from 1,330 to 4,250 feet squared per day (124 to 395 meters squared per day). This indicates that conventional aquifer-test analysis does not yield the uniform results that might be expected of the relatively homogeneous sandstone. For the purpose of calculating long-term pumping effects, a generalized selected value for transmissivity of the Navajo Sandstone is 1,500 feet squared per day (139 meters squared per day); and a generalized selected value for the storage coefficient under artesian conditions is 0.001. For water­ table conditions, the value for the specific yield is estimated to be between 5 and 10 percent. 1 INTRODUCTION This report presents part of the results of a study of water in bedrock in the lower Dirty Devil River basin area in parts of Emery, Garfield, and Wayne Counties, Utah (fig. 1), with special emphasis On the Navajo Sandstone of Triassic and Jurassic age. The study was made by the U.S. Geological Survey in cooperation with the Utah Department of Natural Resources, Division of Water Rights. Fieldwork was carried out July 1975-September 1977. The purpose of this report is to present the results of test drilling and aquifer testing in the Navajo Sandstone in and near the Red Desert northwest of Caineville (fig. 2) and related data acquired during the investigations carried out by the Intermountain Power Project during 1975-76. Data in the report include aquifer-test analyses, core analyses, selected records of wells and springs, and selected chemical analyses. Caineville is near the southeast corner of T. 28 S., R. 8 E., approx­ imately 17 mi (27 km) west of Hanksville in Wayne County. The test area is mainly in the Red Desert, a deeply dissected erosional valley in the south­ central part of T. 28 S., R. 8 E.; it includes wells in secs. 29 and 33. Observations also were made at wells and springs in T. 28 S., R. 7 E., to the west. Background The Intermountain Power Project (IPP) is the successor to the Inter­ mountain Consumers Power Association (ICPA) in the planning for construction of a coal-fired electric-generation plant in the area. Preliminary studies began about 1971, and in the winter of 1973-74, ICPA drilled a test well in the NW~SW~SE~ sec. 29, T. 28 S., R. 8 E. (fig. 2). This location was recommended by S. B. Montgomery of the Utah Division of Water Resources because it was at the point of minimum depth to the Navajo Sandstone near an oil test that reportedly discharged large amounts of water during the drilling of the Navajo section.
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